Alert archive / Minnesota / Tornado Warnings in 1999

Tornado Warning 31, NWS Twin Cities, MN

August 9, 1999Freeborn County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 9, 1999, 8:36 PM CDT for Freeborn County, Minnesota. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 9, 1999, 8:36 PM CDT (01:36 UTC)
Expired
Aug 9, 1999, 9:15 PM CDT
In force
39 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Freeborn County, MN

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 9, 6:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.6 hours before the alert went out and 132 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 1999-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1808 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1999-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 291 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1808 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
733 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
291 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
2.4
Supercell composite
13.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMSP 100136 RRA
TORMSP
MNC047-100215-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
836 PM CDT MON AUG 9 1999

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES/CHANHASSEN HAS
ISSUED A

* TORNADO WARNING FOR...
  FREEBORN COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 915 PM CDT

* AT 834 PM CDT...SEVERE WEATHER SPOTTERS REPORTED A FUNNEL CLOUD
  JUST WEST OF ALBERT LEA.  THE STORM WAS MOVING SOUTHEAST AT 35
  MPH.

* SOME LOCATIONS AFFECTED
  ALBERT LEA
  CONGER
  TWIN LAKES
  EMMONS
  GLENVILLE


ABANDON MOBILE HOMES!  GO IN A NEARBY STURDY BUILDING.  AS A LAST
RESORT LIE FLAT IN A DITCH AND COVER YOUR HEAD!
TDK


&

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 7:03 PM CDTTornado WarningMPXGoodhue42 min
Aug 9, 7:07 PM CDTTornado WarningMPXRice33 min
Aug 9, 7:14 PM CDTTornado WarningMPXLe Sueur31 min
Aug 9, 7:37 PM CDTTornado WarningMPXRice, Steele38 min
Aug 9, 7:42 PM CDTTornado WarningMPXGoodhue33 min
Aug 9, 8:14 PM CDTTornado WarningMPXSteele31 min
Aug 9, 8:14 PM CDTTornado WarningMPXGoodhue31 min
Aug 9, 8:18 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn57 min

Nearby

Tornado Warnings in Minnesota, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.